Digital Commons Network^™

Extended Life Qualification Of The Magnetically Shielded Miniature (Masmi) Hall Thruster, Vernon H. Chaplin, Jacob B. Simmonds, Matthew P. Byrne, Dan M. Goebel, Alejandro Lopez Ortega, Robert B. Lobbia, Ioannis G. Mikellides, Richard R. Hofer, Brian X. Zhu, John M. Ratliff, Ryan W. Conversano

Small Satellite Conference

We present an update on the life qualification of the Magnetically Shielded Miniature (MaSMi) Hall thruster (also known as the ASTRAEUS Thruster Element), which was developed at the Jet Propulsion Laboratory and was recently licensed to ExoTerra Resource for flight production (renamed Halo12). In 2020-2021, the thruster successfully completed a 7205-hour wear test at operating powers from 200-1350 W, processing over 100 kg of xenon propellant and producing 1.55 MN-s total impulse with no measurable degradation in performance. The wear test is being extended to further demonstrate the service life capability of the thruster. In separate tests, prot-flight MaSMi hollow …

Effect Of Expansion And Tumor Challenge On Chemokine Receptor Expression In Cord Blood-Derived Car-Nk Cells, Sam Rosemore, Pinghua Liu, Pinaki Banerjee, Rafet Basar, Sunil Acharya, Hind Rafei, Katy Rezvani

Summer Experience 2023

No abstract provided.

Nasa Spacecube Next-Generation Artificial-Intelligence Computing For Stp-H9-Scenic On Iss, Alessandro Geist, Gary Crum, Cody Brewer, Dennis Afanasev, Sebastian Sabogal, David Wilson, Justin Goodwill, James Marshall, Noah Perryman, Nick Franconi, Timothy Chase Jr., Travis Wise, Sarah Flanagan, Michael Monaghan, Jeff Hosler, Leyland Young, Judy Kuntz, Lindsey Seo, Joseph Schreck, Tracy Price, Munther Hassouneh, Steven Kenyon, Samuel Price, Christopher Wilson, Nicole Thai, Madison Hobbs, Andrew Keene, Sammy Lin, Michael Nemerouf, Evan T. Kain, Francisco O. Viramontes, Tyler M. Lovelly

Small Satellite Conference

Recently, Artificial Intelligence (AI) and Machine Learning (ML) capabilities have seen an exponential increase in interest from academia and industry that can be a disruptive, transformative development for future missions. Specifically, AI/ML concepts for edge computing can be integrated into future missions for autonomous operation, constellation missions, and onboard data analysis. However, using commercial AI software frameworks onboard spacecraft is challenging because traditional radiation-hardened processors and common spacecraft processors cannot provide the necessary onboard processing capability to effectively deploy complex AI models. Advantageously, embedded AI microchips being developed for the mobile market demonstrate remarkable capability and follow similar size, weight, …

Applications Of Systems Engineering Methodologies To An Undergraduate Student Volunteer-Led Cubesat Constellation, Joanna Cai, Ethan Ledig, Joshua Lazaruk

Small Satellite Conference

The Northern Space Program for Innovative Research and Integrated Training (Northern SPIRIT) satellite consortium launched in March 2023 and consists of three CubeSats designed, assembled, and operated by AlbertaSat, a University of Alberta student group:

• Ex-Alta 2: a 3U CubeSat containing an open-source, multispectral imager designed for wildfire prediction, detection, and prevention.
• YukonSat and AuroraSat: 2U CubeSats developed in collaboration with Yukon University and the Aurora Research Institute, each with an educational outreach payload that can receive, display, and photograph community submitted artwork and messages.
• All three satellites have digital fluxgate magnetometer payloads, and nearly identical buses composed …

Cubesat System Reference Model (Csrm) As An Omg Specification, David Kaslow, Daniel Brookshier, Alejandro Levi, Steven A. Maclaird

Small Satellite Conference

This paper describes the transformation of the CubeSat Reference Model™ (CSRM™) into an Object Management Group® (OMG®) specification, as effected by the International Committee on System Engineering (INCOSE) Space System Working Group (SSWG) from 2016 to 2022.

The CSRM is a logical model of engineering artifacts used by a CubeSat mission team to build its mission-specific logical and physical models according to its individual engineering methodology. It is based on Model-Based System Engineering (MBSE) principles, is OMG System Modeling Language (SysML) compliant, is hosted on a graphical modeling tool, and is intended to foster completeness and economies of scale associated …

Maveric: Exploring Space Visualization Technology Through Academic Flight Programs, C. Garrido, S. Lin, J. Di, J. Bergstrom, B. Rios, B. Byrne, S. Clements, A. Dhabekar, B. Dadhich, D. Barnhart

Small Satellite Conference

Magnetic Vector and Remote Imaging Communication satellite (MAVERIC) is a science and technology CubeSate designed and built by students at the University of Southern California (USC) and Space Engineering Research Center (SERC). MAVERIC is a student-led and built CubeSat under the Department of Astronautical Project Class for Microsatellites, with a mission to test out science and technology.

Afrl Recurve Mission Success, Loss, Diagnosis, And Lessons Learned, Tyler De Caussin, Kate Yoshino, Lee Jasper, Franklin Hinckley, Brandon Shirley

Small Satellite Conference

Small satellites are making leaps in capability and are more often successful than even 5 years ago. However, there are many practices and approaches that are fairly new and deserve consideration for their efficacy. AFRL’s Small Satellite Portfolio (SSP) has been researching both first-of-their-kind technology demonstrations and the practices/approaches for their implementation. This paper discusses those practices and their results on the recent flight mission Recurve.

The Portfolio, somewhat uniquely, has the ability to execute flight demonstrations starting from concept and ending in operations, literally under one roof. Recurve was comprised of in-house developed and vendor supplied subsystems; in-house flight …

An Ultra-Compact Ion Mass Spectrometer For Observations Of Planetary Ionospheres, Carlos A. Maldonado, Gabriel Wilson, Justin Mcglown, Heidi Morning, Daniel Arnold, Thomas K. Kim, Tatiana N. Espinoza, Micalah Miller, Anthony J. Rogers, Daniel Reisenfeld, Michael Holloway

Small Satellite Conference

The Compact Ion Mass Spectrometer (CIMS) is an ultra-low resource ion mass spectrometer being designed to make observations of low-energy space plasmas such as that in planetary ionospheres. The CIMS utilizes a laminated collimator to define the field-of-view, a laminated electrostatic analyzer to selectively filter ions based on energy-per-charge (E/qM/q), and a microchannel plate with a position sensitive cross-delay anode assembly (XDL/MCP) to detect the location of the ions on the detector plane. This ion mass spectrometer is a simple, compact, and robust instrument ideal for obtaining low-energy (0.1 eV to 1000 eV) ion composition measurements of terrestrial …

Functional Simulation Of The Uses Of The Onboard Inter-Satellite Network In A Swarm, Pierre Boan, Cécile Dechoz, Julien Galizzi, Patrick Gélard, Yoan Grégoire, Hervé Guillon, Pierre-Baptiste Lambert, Bernard Pontet, Patrice Raveneau, Marie Sauvaud, Irene Valenzuela-Molina, Gavin Walmsley

Small Satellite Conference

There are several network simulators (some on the shelves) that are very useful and helpful for network engineering. Nevertheless, none is efficient enough for simulating an onboard network spread among spacecrafts that are moving in space according to Kepler laws.

Therefore, we tried to fill this gap by building our own tool based on the CNES expertise in space simulator benches. Our bench simulates the environment and the dynamics of each spacecraft, provides a model of the physical layer of the network layer (i.e. Radio Frequency transmission between moving vehicles) and offers an interface to run actual Flight Software. Embedding …

Independent Promotion Of Young Talents In Satellite Development On The Full-Scale Satellite Mission Source, Daniel Galla, Sabine Klinkner, Michael Lengowski, Robin Schweigert, Klemens Boltenhagen, Natascha Bonidis, Bastian Krämer, Jonas Meth

Small Satellite Conference

The SOURCE mission is the first student satellite developed at the University of Stuttgart. This unique opportunity for undergraduate and graduate students is made possible by the cooperation between the Institute of Space Systems (IRS) and the Small Satellite Student Society (KSat e.V.)

Design Of A Low Micro Vibration High Precision Cubesat Reaction Wheel, Cedric Cuypers, Tjorven Delabie, Jelle Lanting, Win De Munter, Rhimas Van De Putte, Joren Malfroy, Lubna Hamid

Small Satellite Conference

Rolling element bearings are known to generate higher order harmonics. These harmonics can reach up to the 10th or higher engine order [1]. When wheels are used in a wide speed range, these higher order harmonics can pass and excite rotor eigenfrequencies and rotor modes, severely increasing the exported μ-vibrations at these frequencies. The amplification of these frequencies will then be governed by the quality factor (Q-factor) of the rotor. Single piece rotors have several advantages such as affordable tight tolerances, uniform mass and elimination of assembly errors, but such monolithic metallic structure feature high Q-factors. Material choice is …

Small Satellite Payload Calibration, Deron Scott, Cole Miller, Eli Salay, Shane Canfield, Scott Hansen, Matt Berghout, Jan Kunzler, Duane Miles

Small Satellite Conference

This project focused on developing an efficient and cost-effective method for calibrating optical payloads that streamlines setup, measurement, and analysis time while staying within a SmallSat budget. To develop and test the concept, the team identified key calibration parameters and performed a demonstration on a surrogate payload using spatial, spectral, and radiometric calibration methods. Calibration results were derived from the demonstration and are detailed below.

A Ray-Tracing Algorithm For Computing Self-Shadowing Of Complex Spacecraft Geometries, Matt Pierce, Jack Huun

Small Satellite Conference

As spacecraft geometries become more complex, particularly for In-Space Servicing, Assembly, and Manufacturing (ISAM) missions, higher fidelity models of shadowing are often necessary for more accurate planning and performance modeling in the mission operations center. For geometries where a vehicle may shadow a large portion of itself, these models must consider self-shadowing events, in addition to planetary eclipses, to provide an accurate estimate of forces and torques from Solar Radiation Pressure (SRP) and more realistic power generation estimates. SRP plays a pivotal role in determining spacecraft fuel usage and momentum accumulation. Many existing models simplify spacecraft geometries to either a …

Parametric Assessment To Fully Deploy Autonomous Small Satellite Constellations For Cislunar Space, Mohammed Irfan Rashed, Hyochoong Bang, Nate Mccoun

Small Satellite Conference

In this new age of cislunar competition for attaining the optimal solutions for Earth and the Moon, NewSpace stakeholders have leaned toward sustainable operations. Both industry and academia play major roles in this era of challenging space survival with the growing number of missions and debris. This paper focuses on scaling and optimizing small satellite ( < 500 kilograms) constellations and utilizing them in cislunar space by evaluating earth observation missions’ constellations for support in Artemis-2-like missions for Lunar orbits. From an astrodynamics point of view, a significant amount of scaling of constellations is done by identifying the parameters affecting the performance, which are mission-specific to their environments with fewer satellites. A detailed parametric analysis of medium-sized constellations, operable in cislunar space, for critical applications like communication (Lunar region) and disaster management (Earth region) is presented. Literature, related dynamics, discussions of the possible futuristic scenarios, discussions, and conclusions are explored.

Imaging Spectrometer Implementation On A Small Satellite Platform For Aquatic Ecosystems Science, Corrie Smeaton, Ronald Lockwood, Michael Chrisp, Charles Bachmann, Laura Kennedy, Steve Gillmer, Linda Fuhrman, Derrick Brouhard, Jade Wang

Small Satellite Conference

The implementation of Imaging spectrometers with state-of-the-art performance on small satellites is challenging due to the size, weight, and power (SWaP) limitations. We have recently developed a compact form, the Chrisp Compact VNIR/SWIR Imaging Spectrometer (CCVIS), that facilitates their usage without sacrificing performance. The CCVIS enables a modular implementation that, combined with a freeform telescope, produces a wide field of view with high signal to noise ratio (SNR) performance. The targeted scientific application is the study of aquatic ecosystems. The imaging spectrometer is designed to address carbon sequestration in coastal margins and wetlands, kelp and seagrass studies, coral reefs, harmful …

Scouts Missions: Esa New Program For Science Mission Based On Small Satellite, Massimiliano Pastena, Jean-Pascal Lejault, Dominique Gilliéron

Small Satellite Conference

This paper presents the main characteristics of the new Scout framework in ESA's Earth Observation directorate aimed to exploit and support the New Space initiative in Europe in the frame of Earth science missions. In particular, details will be provided to explain the subtle balance between the commercial new space aspects and the science traditional aspects of the Scout framework. An overview of the 4 missions selected during the first consolidation round will be given as well as the one under development highlighting for each one the innovations, applications as well as the challenges and the achievements of the development …

Prototype Testing Results Of Charged Particle Detectors And Critical Subsystems For The Esra Mission To Gto, Carlos A. Maldonado, Jonathan Deming, Brooke N. Mosley, Justin Mcglown, Anthony Nelson, Philip A. Fernandes, Anthony J. Rogers, Douglas Patrick, Martin Kroupa, Michael Caffrey, Susan Mendel, Kerry Boyd, August Gula, Kim Katko, Markus P. Hehlen, Daniel Arnold, Jonathan Barney, Ted Schultz, Daniel B. Reisenfeld, Ruth Skoug, Angus Guider, Michael Holloway, Heidi Morning, John T. Steinberg, Erik Krause, Andrew Kirby, Darrel Beckman, Justin Tripp, Keith S. Morgan, Zachary Miller, Robert Merl, Paul S. Graham, Joshua Ortner, Quinten Cole, Chuck Clanton, Brian A. Larsen, Tom Fairbanks, Jeffrey George, Rory Scobie, Kasidit Subsomboon, Kristina Mckeown, Katherine Alano, John Michel, Darren Harvey, Andrew Harvilla, Donathan Ortega

Small Satellite Conference

The Experiment for Space Radiation Analysis (ESRA) is the latest of a series of Demonstration and Validation (DemVal) missions built by the Los Alamos National Laboratory, with the focus on testing a new generation of plasma and energetic paritcle sensors along with critical subsystems. The primary motivation for the ESRA payloads is to minimize size, weight, power, and cost while still providing necessary mission data. These new instruments will be demonstrated by ESRA through ground-based testing and on-orbit operations to increase their technology readiness level such that they can support the evolution of technology and mission objectives. This project will …

Compact Midwave Infrared System (Cmis) For Feature Tracking, Michael Kelly, Warren Chen, James L. Carr

Small Satellite Conference

The Compact Midwave Infrared System (CMIS) is a multi-angle, multi-spectral radiometer designed for high-spatial resolution stereo imaging in the shortwave infrared (SWIR)/midwave infrared (MWIR). The unique design of CMIS enables the capability to track diverse targets ranging from hot wildfires to cold clouds. CMIS is a low-size, -weight and -power (SWaP) instrument that can be accommodated on a small-satellite constellation to enable a rapid revisit rate needed for characterizing dynamic scenes. CMIS employs mature stereographic techniques to retrieve object heights and motion vectors that are free of the ambiguities between height assignment and along-track motions that are apparent in some …

Analysis Of An Energetic Electron Injection At Geo Using Falconseed: A Low Swap-C, Cubesat-Compatible Instrument For Space Environments, Anthony J. Rogers, Carlos A. Maldonado, John D. Williams, Matthew G. Mcharg, Robert A. Vincent, Richard Balthazor

Small Satellite Conference

We present a detailed analysis of an energetic electron injection (10s - 100s keV) observed at geostationary Earth orbit (GEO) on March 5, 2022 in order to highlight the capabilities of the Falcon Solid-state Energetic Electron Detector (SEED). The high time- and energy-resolution of SEED are used to quantify the dispersion of the injection front and to explore the morphology of the energy distribution throughout the injection encounter. Observations of the same event from nearby platforms are included for context. The SEED is a CubeSat compatible, single element particle telescope, designed to measure 14 to 145keV electrons in GEO. The …

The Pandora Smallsat: Mission Overview, Jordan Karburn, Pete Supsinskas, Hilary Johnson, Maricris Schneider, Elisa Quintana, Jessie Dotson, Knicole Colon, Tom Barclay, Christina Hedges, Jessie Dotson

Small Satellite Conference

The NASA Pioneers Program is tasked with performing compelling astrophysics science at lower cost, with smaller hardware, compared to Explorers Program missions. The Pandora SmallSat was selected as an inaugural Pioneers mission. Pandora uses an aluminum, 45-cm, dual channel Cassegrain telescope as its scientific instrument. The instrument will obtain the first dataset of simultaneous, multiband, long-baseline observations of exoplanets and their host stars. The goal is to use these data to reliably characterize planetary atmospheres by disentagling star and planet signals in transmission spectra.

Early in project formulation, the Pandora team developed a suite of high-fidelity parametrized simulation and modeling …

Machine Learning Techniques To Predict The Air Quality Using Meteorological Data In Two Urban Areas In Sri Lanka, Lakindu Mampitiya, Namal Rathnayake, Lee P. Leon, Vishwanadham Mandala, Hazi Md. Azamathulla, Sherly Shelton, Yukinobu Hoshino, Upaka Rathnayake

Department of Earth and Atmospheric Sciences: Faculty Publications

The effect of bad air quality on human health is a well-known risk. Annual health costs have significantly been increased in many countries due to adverse air quality. Therefore, forecasting air quality-measuring parameters in highly impacted areas is essential to enhance the quality of life. Though this forecasting is usual in many countries, Sri Lanka is far behind the state-of-the-art. The country has increasingly reported adverse air quality levels with ongoing industrialization in urban areas. Therefore, this research study, for the first time, mainly focuses on forecasting the PM₁₀ values of the air quality for the two urbanized areas …

Cooperative 3d Printing Platform, Wenchao Zhou, Lucas G. Marques, Robert Austin Williams

Patents Granted

A 3-D printing system comprising a plurality of printers. The printers are motorized to allow movement in X and Y directions or to rotate freely. Each printer may have one or more printheads. Also provided is a surface independent from said printers adapted to receive a printed object.

Secondary Features Of Importance For A Url Ranking, Atajan Abdyyev

Dissertations and Theses

This paper investigates the impact of secondary ranking factors on webpage relevance and rankings in the context of Search Engine Optimization (SEO), focusing on the jewelry domain within the United States e-commerce market. By generating a keyword list related to jewelry and retrieving top URLs from Google's search results, the study employs machine learning models including XGBoost, CatBoost, and Linear Regression to identify key features influencing webpage relevance and rankings.The findings highlight specific optimal ranges for features like Outlinks, Unique Inlinks, Flesch Reading Ease Score, and others, indicating their significant impact on better rankings. Notably, Random Forest model performed best …

Analisis Faktor-Faktor Yang Berhubungan Terhadap Keselamatan Di Tempat Kerja Pada Pt. X Semasa Pandemi Covid-19, Muhammad Faqih Hartono, Fatma Lestari

National Journal of Occupational Health and Safety

PT X Unit Citeureup is the largest cement manufacturing industrial plant in the world. The industrial processes in PT X Unit Citeureup involve a variety of processes, materials, and hazardous works. Thus, the work process in it causes a lot of occupational safety and health risks. In addition, at this time PT X Unit Citeureup is also facing the challenges of the COVID-19 pandemic just like other industries. This situation can have a negative impact on both employees and management of PT X Unit Citeureup. Based on this situation, the establishment of safety in the workplace is something that must …

Analisis Hubungan Faktor Fisik Dan Individu Terhadap Prevalensi Keluhan Musculoskeletal Disorder (Msds) Pada Pekerja Cv Bengkel Otomotif Tahun 2022, Hamzah Fansuri Fajri, Robiana Modjo

National Journal of Occupational Health and Safety

Complaints of musculoskeletal disorders (MSDs) in general can occur due to contraction or excessive loading of muscles or bones. One example of an activity that can trigger the incidence of musculoskeletal disorders (MSDs) is manual material handling work. Manual material handling work is still commonly found in the work done at CV Bengkel Otomotif. This study focuses on looking at the relationship between physical and individual variables with complaints of musculoskeletal disorders (MSDs) in CV Bengkel Otomotif workers. This research is a cross-sectional study with quick exposure check and nordic body map instruments. Of the 60 workers who became respondents …

Optimization Of Light Spectrum During Coral Grow-Out, Daisy N. Ponce

All HCAS Student Capstones, Theses, and Dissertations

Direct and indirect anthropogenic stressors have led to a global decline of coral populations. Coral restoration aims to mitigate this loss and facilitate reef recovery. In particular, the sexual propagation of corals ex situ allows for the production and outplant of genetically diverse coral recruits on the reef. However, optimization at ex situ coral nurseries is required to scale-up production. This project aims to investigate and develop methods that reduce the duration of grow-out ex situ by determining the optimal light spectrum under which to rear for sexual recruits of the tropical scleractinian coral species Pseudodiploria strigosa and P. …

A Critical Inter-Subunit Interaction For The Transmission Of The Allosteric Signal In The Agrobacterium Tumefaciens Adp-Glucose Pyrophosphorylase, Hiral Patel, Gabriela Martinez-Ramirez Ms., Emily Dobrzynski, Alberto A. Iglesias, Dali Liu, Miguel Ballicora

Chemistry: Faculty Publications and Other Works

ADP-glucose pyrophosphorylase is a key regulatory enzyme involved in starch and glycogen synthesis in plants and bacteria, respectively. It has been hypothesized that inter-subunit communications are important for the allosteric effect in this enzyme. However, no specific interactions have been identified as part of the regulatory signal. The enzyme from Agrobacterium tumefaciens is a homotetramer allosterically regulated by fructose 6-phosphate and pyruvate. Three pairs of distinct subunit-subunit interfaces are present. Here we focus on an interface that features two symmetrical interactions between Arg11 and Asp141 from one subunit with residues Asp141 and Arg11 of the neighbor subunit, respectively. Previously, scanning …

Regulation Of Stress Responses And Membrane Morphology By Dspa In Synechocystis Sp. Pcc 6803, Rebekah Kathryn White

Theses and Dissertations

In the world of microorganisms, cyanobacteria are a uniquely skilled powerhouse. They participate in global nutrient and carbon cycling. They have the ability to photosynthesize, which allows them to use sunlight and carbon dioxide to produce cellular energy. However, photosynthesis has a lot of points were environmental stresses can interfere, increasing the chances of oxidative stress and nutrient imbalances that can amplify deleterious effects. One regulator in particular will be the target of this study. DspA, also known as Hik33, is a histidine kinase that perceives and regulates multiple overlapping stress responses. In this project, abiotic stress effects will be …

August 8, 2023 Ereporter, University Of Alabama At Birmingham

eReporter (campus newsletter)

No abstract provided.

Supporting The “Virtuous Cycle” In Urban Ecosystems: How Research Can Inform Plans, Policies, And Projects That Impact Urban Resilience, Michele Romilini, Sophie S. Parker, Gregory B. Pauly, Eric M. Wood

Center for Urban Resilience Scholarship

No abstract provided.